Retrieved Items (aka ,,Caches’‘)¶
What is a Cache?¶
Basically every single bit of metadata returned from libglyr is a Cache. It is basically a result or it is sometimes referred to as an item. It encapsulates basic attributes like a bytearray of data, a checksum, an optional imageformat and some more.
What can I do with one?¶
Caches can be...
- … committed to a local database (see next section)
- … written to HD via it’s
write()method. - … printed to stdout via
print(), currently__repr__is not implemented.
You can use the data property to get the actual metadata. This is always a bytestring, even with lyrics. You have to convert it to the desired encoding (e.g. utf-8) like this:
str(some_cache.data, 'utf-8')
Note
This might throw an UnicodeError on non-utf8 input, or imagedata. Use the Query-Property force_utf8 to only retrieve valid utf-8 textitems.
The data property is settable. Setting will also cause the size and checksum to be adjusted.
Note
Cache implements the __eq__ and __ne__ operator, which will compare only the data properties. This is meant to be a shortcut, since comparing data is usually the only thing you want to compare.